Never mind lol I finally figured out that you need to deposit funds into your post-paid account to use this feature. Hopefully this is what the problerm was. This isn't explained anywhere in the international roaming instructions.   Here's what the activation email says:   "International Roaming usage is Pay As You Go out of your Prepaid Balance. If your Prepaid Balance is insufficient, you will not be able to use international roaming. You can top up your Prepaid Balance at any time in My Account."   I don't have a prepaid account, so the reference to 'Prepaid Balance' doesn't make any sense. Perhaps it would be better to tell people "You need to prepay for any international roaming usage ahead of time by transferring funds to your account, which will be debited as you use the service" and highlight this in the actual instructions for activating international roaming?   Hopefully this saves others some trouble! ... View more